Specifications
- Brand
- Mahle
- Part #
- 4030-300S
- UPC
- 4030-300S

Mahle MS 4.030in 3.0MM Oil Ring Expanders - Standard Tension
$19.83
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Mahle 4.030in 3.0MM oil ring expanders - standard tension. For engine rebuilds needing specific piston ring sizing.
Key Features
- Fits pistons requiring a 4.030 inch bore size.
- Designed for a 3.0 millimeter oil ring width.
- Standard tension for typical engine applications.
- Mahle is a well-known brand in engine components.
⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more
Product Details
Mahle offers these 4.030 inch oil ring expanders with a 3.0 millimeter standard tension. These are a key component when rebuilding an engine, specifically for the oil control ring assembly on a piston. They work to keep the oil control ring properly seated and provide the necessary tension to scrape excess oil from the cylinder wall.
When you're rebuilding an engine, getting the right piston ring components is critical for proper sealing and oil control. These Mahle expanders are well-built and designed to fit pistons requiring a 4.030 inch bore size and a 3.0 millimeter oil ring width. Using the correct expander ensures the oil ring functions as intended, preventing excessive oil consumption and maintaining good compression.
This set is for standard tension applications. Always refer to your engine's specific service manual for the correct ring configuration and tension requirements during your rebuild.
Specifications
- Brand
- Mahle
- Manufacturer Part #
- 4030-300S
- UPC
- 4030-300S
Frequently Asked Questions
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Mahle MS 4.030in 3.0MM Oil Ring Expanders - Standard Tension




